Public bug reported:
Binary package hint: apparmor
Context:
I'm trying to get cups to print to an old label printer connected to my
laptop through an usb-to-RS232 cable. Ubuntu 10.10.
Bug:
AppArmor prevents cups to access /dev/ttyUSB0. CUPS returned a
"permission denied error". I expect that CUPS sends the data to the
printer.
dmesg show:
type=1400 audit(1290167643.039:240): apparmor="DENIED" operation="open"
parent=4772 profile="/usr/sbin/cupsd" name="/dev/ttyUSB0" pid=4802
comm="serial" requested_mask="rw" denied_mask="rw" fsuid=0 ouid=0
After issuing sudo aa-complain /usr/sbin/cupsd printer receives data
(light flashes). It doesn't work but it's likely an unrelated problem.
CUPS stops complaining.
Likely cause:
I don't understand AppArmor, but in /etc/apparmor.d/usr.bin.cupsd I find
this lines:
deny /dev/tty*
/dev/ttyS*
If I understood it correctly (if I do kudos to AppArmor developers), we
need to add another exception for this kind of adapter, something like
/dev/ttyU*
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: apparmor 2.5.1-0ubuntu0.10.10.2
ProcVersionSignature: Ubuntu 2.6.35-23.40-generic 2.6.35.7
Uname: Linux 2.6.35-23-generic i686
Architecture: i386
Date: Fri Nov 19 13:03:51 2010
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Beta i386 (20100901.1)
ProcEnviron:
LANG=gl_ES.utf8
SHELL=/bin/bash
ProcKernelCmdline: BOOT_IMAGE=/boot/vmlinuz-2.6.35-23-generic
root=UUID=d8a4ecb5-65d3-4bc5-8867-4a88c10451c5 ro quiet splash
SourcePackage: apparmor
** Affects: apparmor (Ubuntu)
Importance: Undecided
Status: New
** Tags: apport-bug i386 maverick ubuntu-une
--
AppArmor prevents Cups to print to a serial printer connected through an usb
adapter
https://bugs.launchpad.net/bugs/677432
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